현장 사용자 관점에서의 건설 정보시스템 만족도 분석

윤정환,윤수원,진상윤,김예상,Yoon, Jeong-Hwan,Yoon, Su-Won,Chin, Sang-Yoon,Kim, Yea-Sang 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.4

대부분의 대형 건설기업은 정보화의 일환으로 건설현장의 관리 효율화를 위해 건설 정보시스템을 개발하여 건설현장에 적용하고 있다. 하지만 이러한 건설 정보시스템은 도입과정에서 반드시 수행되어야 하는 실무자 요구사항에 대한 반영은 미흡한 상태에 있으며, 실제 사용자의 자발적 참여가 부족한 상태에 있다. 따라서 본 연구는 10개 건설기업 현장을 대상으로 사용자 관점에서의 설문조사와 인터뷰를 실시하여 현재 구축되어져 있는 건설 정보시스템의 기능 현황 및 건설 정보시스템에 대한 전반적인 만족도, 건설 정보시스템이 가지고 있는 기능에 대한 구축수준 만족도에 대한 분석을 하였으며, 이를 통하여 전설 정보시스템에 대한 건설현잔 사용자들의 전반적인 만족도와 건설정보시스템이 가지고 있는 기능에 대한 만족도를 분석하여 앞으로 건설정보화 시스템이 나아가야 할 방향을 제시하고자 하였다. Most of large construction companies have developed construction information systems and their ultimate goals should be improvement of the management efficiency of the construction projects. In order to make them successful, the systems should be designed to meet system users' needs Therefore purpose of this study is to evaluate the current information management systems from the viewpoint of the system users, especially on-site engineers. Questionnaire surveys and interviews have been conducted for the highly ranked 10 construction companies on four major factors including the functions of the systems and satisfaction level of each function, recognition of the use effect, informatization support. From the surveys results, correlation between the functions of the systems and the others has been statistically analyzed.

청심포자음(淸心蒲子飮)의 구속 스트레스 및 절개 통증에 대한 항스트레스 작용과 진통효과

윤정환,고일규,신말순,김창주,이충열,Yoon, Jeong-Hwan,Ko, Il-Gyu,Shin, Mal-Soon,Kim, Chang-Ju,Lee, Chung-Yeol 대한동의생리학회 2007 동의생리병리학회지 Vol.21 No.4

The aqueous extract of Chungsimyeonja-eum has been used to treat palpitation, anemia, chronic fatigue, hypertension, and stroke. It also possesses various pharmacological effects including hypotensive, blood circulating, sedative, anti-inflammatory, diuretic, and anti-stress activities. In the present results, the latency time of plantar test was decreased in the immobilization stress and incusion pain-induction group. However the paw withdrawal latency values were increased in the immobilization stress and incision pain-induction groups after treatment with the aqueous extract of Chungsimyeonja-eum. The c-Fos expression in the paraventricular nucleus (PVN), and 5-hydroxytryptamine (5-HT) and tryptophan hydroxylase (TPH) in the dorsal raphe were enhanced in the immobilization stress and incision pain-induction groups. However, the treatment with the aqueous extract of Chungsimyeonja-eum suppressed the immobilization stress and incision pain-induced increase of c-Fos, 5-HT, and TPH expressions. Here in this study, we have demonstrated the protective effects of Chungsimyeonja-eum on immobilization and incision pain-induced stress. The present study revealed that Chungsimyeonja-eum treatment diminishes immobilization and pain stress.

평형해법에 의한 스탬핑 공정의 단면 해석

윤정환,유동진,송인섭,양동열,이장희,Yoon, J.W.,Yoo, D.J.,Song, I.S.,Yang, D.Y.,Lee, J.H. 한국정밀공학회 1994 한국정밀공학회지 Vol. No.

An equilibrium approach is suggested as an effective tool for the analysis of sheet metal forming processes on the basis of force balance together with geometric relations and plasticity theroy. In computing a force balance equation, it is required to define a geometric curve approximating the shape of the sheet metal at any step of deformation from the geometric interaction between the die and the deforming sheet. Then the geometic informations for contacting and non-contacting sections of the sheet metal such as the number and length of both non-contact region, contact angle, and die radius of contact section are known from the geometric forming curve and utilized for optimization by force balance equation. In computation, the sheet material is assumed to be of normal amisotropy and rigid-phastic workhardening. It has been shown that there are good agreements between the equilibrium approach and FEM computation for the benchmark test example and auto-body panels whose sections can be assumed in plane-strain state. The proposed equilibrium approach can thus be used as a robust computational method in estimating the forming defects and forming severity rather quickly in the die design stage.

레이저형광여기(LIF)를 이용한 비등온 제트유동의 온도장 측정

윤정환,이상준,Yoon, Jong-Hwan,Lee, Sang-Joon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10

A 2-dimensional temperature field measurement technique using PLIF (Planar Laser Induced Fluorescence) was developed and it was applied to an axisymmetric buoyant jet. Rhodamine B was used as a fluorescent dye. Laser light sheet illuminated a two-dimensional cross section of the jet. The intensity variations of LIF signal from Rhodamine B molecules scattered by the laser light were captured with an optical filter and a CCD camera. The spatial variations of temperature field of buoyant jet were derived using the calibration data between the LIF signal and real temperature. The measured results show that the turbulent jet is more efficient in mixing compared to the transition and laminar jet flows. As the initial flow condition varies from laminar to turbulent flow, the entrainment from ambient fluid increases and temperature decay along the jet center axis becomes larger. In addition to the mean temperature field, the spatial distributions of temperature fluctuations were measured by the PLIF technique and the result shows the shear layer development from the jet nozzle exit.

1996년도 제35차 대한소화기학회 추계학술대회 / 일반연제 : 간 ; 혈청 HBV DNA - 양성 만성 간질환 환자에서 HBsAg 이 검출되지 않는 기전

윤정환,황유진,이효석,김정룡 ( J . H . Yoon,Y . J . Hwang,H . S . Lee,C . Y . Kim ) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.1

Variation of Gold Content in Rocks and Minerals from the Seongsan and Ogmaesan Clay Deposits in the Haenam Area, Korea

윤정환,Yoon, Chung-Han The Korean Society of Economic and Environmental G 1995 자원환경지질 Vol.28 No.6

한국 남서부에 위치한 해남지역에는 산성마그마 활동에 수반된 acid-sulfate 점토광상들이 산출되고 있다. 연구지역의 지질은 응회암, 화강암질암, 석영반암, 유문암, 안산암 및 퇴적암으로 구성되어 있으며 화강암질암과 석영반암은 응회암과 퇴적암을 관입하며 광산주변의 유문암과 응회암은 열수변질을 받았다. 채취된 시료중 67개의 시료를 GFAAS와 ICP로 주성분 원소함량과 금을 비롯한 미량원소함량을 분석한 결과 금은 성산광산에서 산출되는 명반석맥과 규화작용을 심하게 받은 변질대에서 부화된 반면 dickite와 dickite가 함유된 암석이나 광석이 열수변질을 받은 경우에는 결핍된 경향을 보여주며, 특히 단층주변과 단층들이 교차하는 지점에서 금함량이 높은 경향을 나타낸다. 명반석-석영-황철석이 공생하는 명반석이나 명반석맥에서는 금함량이 높으나 황철석을 포함하는 응회암과 dickite에서는 일반적으로 금함량이 낮은 경향을 보여준다. 규화작용을 받은 응회앙에서 금함량은 As, Hg 및 Hg와 정의 상관관계를 보여 주며 대부분의 시료에서 Cd, Hg 및 Sb함량변화는 금함량변화와 유사한 경향을 나타낸다. 따라서 이 연구지역에서 지질학적 및 지구화학적으로 금광상을 탐사하기 위해서는 단층이 교차하는 지점의 silicified zone 또는 황철석을 함유하는 명반석맥을 찾아서 As, Hg 및 Sb 등과 같은 지시원소를 분석하는 것이 중요할 것으로 판단된다. Several acid-sulfate clay deposits associated with silicic magmas occur in the Haenam area of the southwestern part of Korea. Geology of the studied area consists of tuffs, granitic rocks, quartz porphyry, rhyolite, andesite and sedimentary rocks. The granitic rocks and quartz porphyry intruded tuffs and sedimentary rocks. The rhyolite and tuffs around the mines have undergone hydrothermally weak or strong alteration. Gold contents with major and trace elements have been determined for a total of sixty-seven specimens of fresh igneous rocks, wall rocks and minerals such as dickite and alunite by graphite furnace atomic absorption spectrometer and inductively coupled plasma. Gold is enriched in the alunite vein and the silicified zone, but is depleted in dickites and hydrothermally altered rocks with dickite of the Seongsan deposit. Gold is especially concentrated near the faults or conjunction area of two faults. High content of gold is shown in the mineral assemblages of alunitequartz- pyrite in the alunite vein and silicic zone of the Seongsan deposit compared with that of minerals and rocks from another deposits distributed in the studied area. Gold content in tuffs and dickites with pyrite is generally low. Gold content in silicified tuff tends to show positive correlations with content of As, Hg and Sb. Variation trends of Cd, Hg and Sb are similar to those of gold content. From the result of gold content variations, gold may be transported and concentrated by mineralizing solutions ascending along the cracks like fault. Therefore, it is important to survey alunite vein and silicified zone at the conjunction of faults, and to analyze pathfinder elements such as As, Hg and Sb for geological and geochemical exploration of gold in the studied deposits.

Evolution of Plastic Anisotropy Using a VPSC-based Machine Learning Model

P. Fazily(피에만 파질리),J. W. Yoon(윤정환) 한국소성·가공학회 2023 한국소성가공학회 학술대회 논문집 Vol.2023 No.11

석탄화력발전용 회처리 배관 커플링 안전성 평가에 관한 수치해석적 연구

윤정환(Jeong-Hwan Yoon),강상모(Sang-Mo Kang),윤정환(Jung-Hwan Yoon),김시범(Si-Pom Kim) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11

에멀젼연료 증발충돌분무의 거동특성에 관한 수치해석

윤정환(Jeong Hwan Yoon),염정국(Jeong Kuk Yeom) 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.7

본 연구는 수치해석을 이용하여 디젤과 과산화수소를 혼합한 에멀젼연료의 증발거동특성을 분석하였다. 디젤과 과산화수소 22%를 혼합한 에멀젼연료와 디젤을 사용한 충돌분무 실험 결과를 토대로 경계조건을 설정하였다. 상용프로그램(ANSYS CFX)을 사용하여 수치해석을 실시하였다. 수치해석을 통해 에멀젼연료의 증발량, 속도벡터 및 와도분포를 측정하였고, 속도벡터와 와도분포의 분석을 통해 연료의 혼합기형성에 영향을 주는 유동을 분석하였다. 그 결과 연료의 증발이 분무의 혼합에 긍정적인 영향을 미치는 것을 확인할 수 있었다. 디젤보다 혼합 연료인 에멀젼연료를 사용하였을 경우엔 더욱 많은 증발을 통해 신속한 혼합기형성을 기대할 수 있다. In this study, the evaporative behavior characteristics of emulsified fuel mixed with diesel and hydrogen peroxide were analyzed through a numerical analysis. The boundary conditions were set based on the experimental results of the impinging spray using only diesel and emulsified fuel. Numerical analysis was performed using a commercial program (ANSYS CFX). The evaporation rate, velocity vector, and vorticity distribution of the emulsified fuel were measured through the numerical analysis. The flow affecting the fuel mixture was analyzed through the analysis of the velocity vector and vorticity distribution. As a result, it was confirmed that the evaporation of the fuel positively influences the mixing of the spray. Further, when emulsified fuel is used, rapid mixture formation can be expected through evaporation.

자기장에 의한 자기유동탄성체의 전단계수에 관한 연구

윤정환(Jeonghwan Yoon),윤주호(Juho Yun),유승을(Seungeul Yoo) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5